Pyridobenzothiadiazepine compounds

ABSTRACT

Compounds of the formula   D R A W I N G

United States Patent n91 Yale et al.

[ Dec. 31, 1974 PYRIDOBENZOTHIADIAZEPINE COMPOUNDS [75] Inventors: Harry Louis Yale, East Brunswick;

Ramesh B. Petigara, Somerset, both of NJ.

[73] Assignee: E. R. Squibb & Sons, Inc.,

Princeton, NJ.

[22] Filed: Apr. 4, 1973 [21] App]. No.2 347,938

52 us. Cl. 260/2943 B, 260/294.8 F,

.SZSQQ/ 2.94187 1 2Ql 91$12 2 51 Int. Cl C07d 31/50 [58] Field of Search 260/294.8 B, 295 T, 296 H {56] References Cited UNITED STATES PATENTS 3,123,614 3/l964 Yale et al 260/296 T Primary ExaminerAlan L. Rotman Attorney, Agent, or Firm-Lawrence S. Levinson 5 7 ABSTRACT Compounds of the formula 2 Claims, No Drawings OBJECTS OF THE INVENTION It is an object of the present invention to provide new compounds having central nervous system (CNS) stimulating activity. Another object is to provide new compounds having muscle relaxant properties. A further object is to provide intermediates for the preparation of the final compounds of the invention. Yet another object is to provide a method for the preparation of both the intermediate and thefinal compounds of the present invention. Still another object is to provide a method for the administration of the final compounds of the invention. A still further object is to provide pharmaceutical compositions containing as active ingredients the final compounds of the present invention. These and other objects of thefpresent invention will be apparent from the following description.

SUMMARY OF THE INVENTION wherein m may be 1 or 2 R may be the same or different and may be hydrogen, halogen (F, Cl, or Br), alkyl of from one to four carbons, alkoxy of from one to four carbons, alkylthio of from one to four carbons, benzyl, phenethyl, phenyl, phenoxy, phenylthio or monosubstituted phenyl wherein the substituent may be halogen (F, Cl, Br or 1), alkyl of from one to four carbons, alkoxy of from one to four carbons, o'r trifluoromethyl; provided that when R is halogen, R occupies only the 3- or 5-position in the original 2- aminopyridine;

R may be hydrogen, halogen (F, C1, or Br), alkyl of from one to four carbons, phenyl, dialkylamidosulfonyl wherein each alkyl radical may have from one to four carbons,trifluoromethyl;

n may be or 1; R" may be alkyl of from 1 to 4 carbons;

and Z may be S or S0 The foregoing compounds possess central nervous system-stimulating properties and act as muscle relax- 2 DETAILED DESCRIPTION The final compound I of the present invention may be prepared by reacting a 2-aminopyridine II wherein R is as previously defined with an o-bromophenyl-Z- alkylene halide III wherein R is as previously defined and X is chlorine or bromine. This reaction takes place in any solvent or solvent mixture in which the reactants can be dissolved and which has a boiling point of at least about 100C. Typical solvents are aromatic hydrocarbons, ethers, aliphatic alcohols or aryl-substituted aliphatic alcohols. Toluene and xylene are examples of suitable aromatic hydrocarbons. Monomethyl ether of I diethylene glycol, dimethyl ether of diethylene glycol (diglyme), monomethyl ether of ethylene glycol or dimethyl ether of ethylene glycol (glyme) are examples of suitable ethers; n-Amyl alcohol is an example of a suitable aliphatic alcohol, while benzyl alcohol is an ex ample of a suitable aryl-substituted aliphatic alcohol.

. Heating compounds 11 and III in a solvent as described above, or a mixture thereof, at temperatures from about 50C to about 140C for a period of several hours, typically from about 3 to about 24 hours produces a py'ridinium compound IV. The latter is con- =verted to an imino compound V by treating with a water miscible alcohol and an alkali metal alkoxide of up to three carbonatoms, or with an alkali metal carbonate, e.g., K CO Na CO RbCO etc. The reaction takes place at room temperature overa period of from about 1 to about 4 hours, or at from about 50C to about 80C in about 1 hour. Compound V may be converted to the final compound I by treating with a water miscible alcohol and an alkali metal alkoxide of up, to three carbons in the presence of copper at a temperature of from about C to about 120C for a period, typically from about 2 to about hours. Alternatively, IV may be converted directly to l by heating at a temperature of from about 60C to about C for a period, typically from about 2 to about 48 hours, in the presence of potassium carbonate and copper in a solvent such as dimethylformamide, dimethylacetamide, dichloro'benzene, trichlorobenzene, or diethylbenzene. Alternatively, IV may be converted directly to I by heating at a temperature of from about 60C to about 120C for several hours, typically from about 1 to about 4 hours in the presence of an alkali metal hydroxide, alkali metal carbonate, tris-alkali metal phosphate, alkali metal metaborate or alkali metal tetraborate in an anhydrous alcohol solvent, e.g., ethanol, propanol, butanol, pentanol in the presence of copper. Specific examples of suitable compounds include LiOH, NaOl-I, KOH, RbOI-I, CsOH, Na CO K CO Rb CO CS2CO3, Na3PO4, K3PO4, Rb3PO4, YCS3P()4I N212B2O4,

I & n I" N mom) a AN dmorrn R)... I 0 R n l- I It \NH BT/ V The intermediates of formula III- wherein n is O and Z is S may be prepared by refluxing about equimolar amounts of a 1,l-dibromoalkane or a l-bromo-lchloroalkane of one to four carbons VI with a saturated solution of Na SO; for a period of from about 40 to about 120 hours. The resulting l-bromoalkane-lsodium sulfonate Vll is then reacted by heating with about cquimolar amounts of an o-bromothiophenol VII! in the presence of aqueous alkali to'yield a sodium o-bromophenylthioalkylene-sulfonate IX. Treatment of the latter with PCl or PBr at ambient temperature yields the corresponding o-bromophenylthioalkyl chloride or bromide X. The foregoing reaction sequence is illustrated by the following equations The intermediates of formula III wherein n is l and Z is S may be prepared by reacting a l-bromo-2-chloroalkane of formula XI with about equimolar amounts of a compound of formula VIII in the presence of aqueous alkali. Alternatively, a compouund of formula XII may be prepared by reacting an o-bromophenylthioalkanol XIII with PCI or PBr The foregoing reaction sequence is illustrated by the following equations Compounds of formula VIII wherein R is H, halogen, alkyl of from one to four carbons, phenyl, dialkylamidosulfonyl or trifluoromethyl may be prepared by reacting an R-substituted aniline XXIV with N- bromosuccinimide in CCl according to the procedure of Arcoria et al., Ann. Chim. (Rome), 54 139-155 (1964) to yield an o-bromo-R-substituted aniline XXV. Thelatter is treated with NaNO in HCl and then with SO according to the procedure of Meerwein et al., J. prakt. Chem. 152, 237 (l939) to yield the corresponding sulfonyl chloride XXVI. The latter is treated with Zn in H SO according to the procedure of Or- Compounds of the formula III wherein Z is S0 may be prepared by converting a compound of formula XXV to the diazonium chloride XXVIII following the procedure of'Meerwein, et al. supra, and converting the latter to the sulfonyl chloride XXIX following the procedure of Meerwein et al., supra. The sulfonyl chloride is then converted to the sodium sulfinate XXX by reduction with zinc following the procedure of Organic Syntheses, Coll. Vol. 1, pp. 492 (I941). Reacting the sodium sulfinate XXX with a l,l-dihaloalkane follow ing the procedure of Michael et al., J.A.C.S., 6, p. 253 (1884) gives the compound of formula III wherein Z is S0 and n is O. Reacting the sodium sulfinate XXX with a l-bromo-2-chloroalkane following the procedure of Michael et al., supra, gives the compound of formula III wherein Z is S0 and n is l. The foregoing reaction sequence is illustrated by the following equa- Starting materials of formula II wherein R is phenyl, halo-substituted phenyl, alkyl-substituted phenyl, alkoxy-substituted phenyl or trifluoromethyl-substituted phenyl may be prepared by heating 3-(N-acetamido-N- nitroso)pyridine XXIV with benzene, halo-substituted benzene, alkyl-substituted benzene, alkoxy-substituted benzene or trifluoromethyl-substituted benzene according to the procedure of Haworth et al., J. Chem. soc., 1940, 372, and J. Chem. Soc., 1954, 4516. The

product XXV is a 3-substituted pyridine wherein the N-acetamido-N-nitroso radical is replaced by a phenyl or substituted phenyl radical derived from the compound with which the 3-(N-acetamido-N- nitroso)pyridine is heated. The product of formula XXV is treated with sodamide according to the procedure of Chichibabin et al., J. Russ, Phys, Chem. Soc. 46, 1216 (19l4),Chem,Zentr. II, 1064 (l9l5),to give the aminopyridines XXXII and XXXIII.

XXIV X V NaNHz R=halo, alkyl, alkoxy E3 or hydrogen XXXII Z -NH2 I Z F NaNHQ Z F 0 4 o \N N \N/NII2 XXVI XXVII XVIII Z=I-I, or alkoxy XIX Compounds of formula II wherein R is halophenyl may be prepared by reacting a halo-substituted N- nitrosoacetanilide XX with pyridine XXI according to the procedure of Bachmann et al., Organic Reactions, Vol. II, pp. 22426I. The resulting halo-substituted phenylpyridine XXII is treated with sodamide according to the procedure of Chichibabin et. al., supra. to give the desired halophenylsubstituted 2- aminopyridine XXIII. The reaction sequence is as follows:

XXII

XXIII I The compounds of the present invention may be administered to mammalian species as central nervous system stimulants and as muscle relaxants. In the rat, responses to the stimulant activity of the compounds of the present invention include increased activity and body tremors. The muscle relaxant properties manifest themselves by responses that include decreased limb tone, decreased grip strength, and limb paralysis. In both the stimulant and muscle relaxant activities, the onset of activity is rapid, i.e., within about 15 minutes; the activity persists for about 2 hours or longer. In the rat the dosage range varies from about 6.25 to about 50 mg/kg for both activities, while in humans the dosage range varies from about 40 to about 2000 mg. daily in about four divided doses for both activities.

In addition to serving as intermediates for the preparation of compounds of formula I, the pyridinium compounds of formula IV are themselves effective bactericides.

Microbial bioassays, as described in The Microbial World, by R. Y. Stanier, M. Doudoroff and E. A. Adelberg, Prentice-Hall, Inc., Englewood Cliffs, N.J., 3rd Ed., p. 858, are employed to determine the bactericidal properties of the pyridinium compounds IV of this invention. The bacterial employed include Staphylococcus aureus, 1, Streptococcus pyogenes, 2, Salmonella schottmuelleri, 3, Salmonella gallinarum, 4, Pseudomonas aeruginosa, 5, Proteus vulgaris, 6, Escherichia coli, 7, Pasturella multocida, 8, and Mycobacterium tuberculosis, 9.

In the procedure, a sterile agar plate is seeded with the test organism, and then a number of glass cylinders are placed on its surface, forming a series of little cups. A known dilution of the compounds of this'invention is added to each cup and the entire plate is then incubated until significant bacterial growth has occurred. The compounds of this invention diffuse out of the cup into the surrounding agar and produce a zone of inhibition. In this fashion it is possible to find the minimum inhibiting concentration (mic), of the compound that produces a recognizable zone of inhibition. The following summarizes the data.

Micromic'of Pyridinium Compound, organism Micrograms. (mcg)/ml Compound Compound Compound Compound of Ex. 7 of Ex. 32 of Ex. 43 of Ex.

The compounds of the present invention in the described dosages may be administered orally; however, other routes such as intraperitoneally, subcutaneously, intramuscularly or intravenously may be employed.

The active compounds of the present invention are orally administered, for example, with an inert diluent or with an assimilable edible carrier, or they may be enclosed in hard or soft gelatin capsules, or they may be compressed into tablets, or they may be incorporated directly with the food of the diet. For oral therapeutic administration, the active compounds of this invention may be incorporated with excipients and used in the form of tablets, troches, capsules, elixirs, suspensions, syrups, wafers, chewing gum, and the like. The amount of active compound in such therapeutically useful compositions or preparations is such that a suitable dosage will be obtained.

The tablets, troches, pills, capsules and the like may also contain the following: a binder such as gum tragacanth, acacia, corn starch or gelatin; an excipient such as dicalcium phosphate; a disintegrating agent such as corn starch, potato starch, alginic acid and the like; a lubricant such as magnesium stearate; and a sweetening agent such as sucrose, lactose or saccharin may be added or a flavoring agent such as peppermint, oil of Wintergreen, or cherry flavoring. When the dosage unit form is a capsule, it may contain in addition to materials of the above type a liquid carrier such as a fatty oil. Various other materials may be present as coatings or to otherwise modify the physical form of the dosage unit, for instance, tablets, pills or capsules may be coated with shellac, sugar, or both. A syrup or elixir may contain the active compounds, sucrose as a sweetening agent, methyl and propyl parabens as preservatives, a dye and a flavoringsuch as cherry or orange flavor. Of course, any material used in preparing any dosage unit form should be pharmaceutically pure and substantially non-toxic in the amounts employed.

As to the pharmaceutically acceptable salts, those coming within the purview of this invention include the pharmaceutically acceptable acid-addition salts. Acids useful for preparing these acid-addition salts include, inter alia, inorganic acids, such as the hydrohalic acids (e.g., hydrochloric and hydrobromic acid), sulfuric acid, nitric acid, and phosphoric acid, and organic acids such as maleic, fumaric, tartaric,'citric, acetic, benzoic, 2-acetoxybenzoic, salicylic, succinic acid, theophylline, 8-chlorotheophylline, p-aminobenzoic, pacetamidobenzoic, or methanesulfonic.

The following examples illustrate the invention without, however, limiting the same thereto. All temperatures given are in degrees Centigrade.

EXAMPLE 1 [(o-Bromophenyl)thio]methanesulfonic acid, sodium salt To a solution of 40.0 g of o-bromobenzenethiol in aqueous sodium hydroxide (10.0 g of sodium hydroxide in 40 ml of water) is added 60.0 g of bromomethanesulfonic acid, sodium salt and the mixture is heated so that the water distills. To the dry residue is added a second portion of 40 ml of water and the distillation to dryness is repeated. The dry residue is heated for three hours, cooled, and dissolved in 600 ml of hot water. The pH is adjusted to 5.0 and cooled to give about 63.3 g of the named compound, mp 310".

EXAMPLE 2 o-Bromophenyl chloromethyl sulfide A mixture of 60.4 g of [(o-bromophenyl)thio]methanesulfonic acid, sodium salt and 98.0 g of phosphorus pentachloride is blended until liquified, diluted with 600 ml of ether, and then poured on 1.2 kg of crushed ice. The ether layer is separated, washed, dried, and concentrated to give about 43.7 g of the named compound, bp about 86 (0.6 mm). mp about 28-30.

EXAMPLE 3 2-Amino-1-[[(o-bromophenyl)thiolmethyl]pyridinium chloride To a solution of 14.1 g of 2-aminopyridine in 180 ml of xylene is added a solution of 24.0 g of obromophenyl chloromethyl sulfide in 40 ml of xylene. The mixture is heated at 90-95 for about 15 hours to give about 27.3 g of the named compound, mp about EXAMPLE4 [(2-Bromo-4-chlorophenyl)thio]methanesulfonic acid, sodium salt To a solution of 49.2 g of 2-bromo-4- EXAMPLE 5 [(2-Bromo-4-tolyl)thio]methanesulfonic acid, sodium salt When 44.7 g of 2-bromo-4-toluenethiol replaces the 2-bromobenzenethiol in Example 1, there is obtained about 65.7 g of the named product, mp 300.

The 2-bromo-4-toluenethiol is prepared from 2- bromo-p-toluidine by the procedure reported in Organic Syntheses (vide supra).

EXAMPLE 6 [(2-Bromo-4-(a,a,a-trifluoro-p-tolyl)thio]methanesulfonic acid, sodium salt A. To 161.0 g of p-aminobenzotrifluoride and 10.0 g of iron filings is added, dropwise, with agitation at 3540, 160.0 g of bromine, using a slow stream of nitrogen to sweep out the evolved hydrogen bromide. Subsequently, the mixture is agitated for an additional 2 hours and then distilled in vacuo to give 3-bromo-4- aminobenzotrifluoride.

B. The product from (A) is subjected to the procedure of Organic Syntheses (vide supra) to give 2- bromo-4-a,a,a-trifluoro-p-toluenethiol.

C. By substituting 56.6 g of a,a,a-trifluoro-ptoluenethiol for the o-bromobenzenethiol in example 1, there is obtained about 70.2 g of 2-bromo-4-(a,a,atrifluoro-p-tolyl)thio]methanesulfonic acid, sodium salt, mp 300.

EXAMPLE7 6H-Pyrido[l,2-c][1,3,5]benzothiadiazepine A mixture of 33.2 g of 2-amino-l-[[(obromophenyl)thio[methyl[pyridinium chloride, 27.7 g of anhydrous potassium carbonate, 0.8 g of copper bronze, and 750 ml of n-propanol is heated and stirred,

under reflux, for 24 hours, filtered hot, and the filtrateconcentrated to dryness in vacuo. The residue is dissolved in 600 ml of ether, and the ether solution is washed, dried, decolorized with Darco, and concentrated to give about.23.7 g of a yellow solid. Recrystallization from cyclohexane-benzene gives about 17.4 g of 9 EXAMPLE 8-17 By employing theprocedure described in Organic the named compound, mp about l35-l37.

0 chlol'o methyl sulfides in Column 3.

Example I N0. Aniline derivative Thiol derivative Cliloromethyl sulfide 9 (3H3 (3H3 C|3H2 NH: SH S CHzCl -Br Br Br N112 S H S CHzCl (CH3)3C- Br (011;)30- Br (CH3)3C Br 11. ([JF; olFs (EFa Br Br Br NH; SH SCH2Cl l2 ?CII3 (llCHs (|)CH3 Br Br I B1 l l NH; SH SGH CI 13 IIIHQ SII'I SCHzCl Br Br Br CzHs CzHs C2H5 14 ?CH3 SlCHa SICHa Br Br Br I l NH; SH SCHzCl SCHs S CH3 S OH;

Br Br Br 1 l l NH2 SH S CH2C1 CHaS- CHaS CHaS- Br Br -Br I l NH; SH S CHzCl 17 sozmorim ?O;N(CH3)2 ?0zN(C a)z llr Br Br I l NH; SH S CHO1 EXAMPLE 18-26 an equivalent amount of the substituted aminopyridine in Column 2 for the aminopyridine in example 3 and employing the procedure of that example the pyridinium chlorides shown in Column 3 are obtained.

Example N 0. Y Chloromethyl sulfide Substituted aminopyridine Pyridinium chloride 1s CH; 01

I Cl- 1.

lol I l B N NH2 N 2/ 1 G9 Br I CHzS SCH2C1 -Bl' 0 -Br (CHa)aC Br NH2 NH2 N N Br I CH,

20, M CF; (I)CHQCH 0113011 0 0 0 SCI'IZCI N112 NHg N Br JIHZS CF(l 21 O C I13 9 i ClIaClIz CH3CII2 0 Cl NH NII2 2 Br I I CHzS S CHzCl 22 S CH CI 9 (CHMCH; -(CH2)aCHa Br NH NH B 2 2 r N 1V I C2H5 s l CHzS l Cal-I5 23 scum 6 -NH2 N NH? CH2S --S CH3 SOH3 0 CI S (11 BI NH: NH:

N N Br S CHa s 011201 I I Example 1 No. Chloromethyl sulfide Substituted aminopyrldine Pyfldinium chloride crns- 0 me i Br CHa-O N/NH2 CHsO @0 -Nll-: TC'lln some! nns- Br 26 sozmcmj w CH3(CI-Iz)4-( 1NII2 6113(01194 N112 N N -Br I S CH2C1 N(CH3)2 EXAMPLE 27 sinters at about 223-225, melts at about 256258 [(2-Bromo-5-ch1orophenyl)thiolmethanesulfonic acid, from methanohsopropanol' sodium salt EXAMPLE 30 By substituting 49.2 g of 2-bromo-5- 2-Bromo-4-chloropheny1 chloromethyl sulfide chlorobenzenethiol for the 2-bromo-4- chlorobenzenethiol in example 4, there is obtained 68.7 g of the named product, mp 300.

EXAMPLE 28 2-1mino-1-[[o-bromophenyl)thiolmethyllpyridine To a suspension of 13.8 g of anhydrous potassium carbonate in 150 ml of anhydrous n-propanol is added 33.1 g of 2-amino-1-[[(o-bromophenyl)thiolmethyl]- pyridinium chloride, portionwise, under nitrogen, at

room temperature, with stirring. Subsequently, the mixture is stirred and heated under reflux for two hours, filtered hot, and the filtrate concentrated in vacuo. The residue is partitioned between 200 ml each of water and ether, the ether layer is'separated, dried,

and concentrated to give about 28.7 g of the named compound, mp about 67-69, after recrystallization from pentane.

EXAMPLE 29 6H-Pyrido[1,2c][1,3,5lbenzthiadiazepine Hydrochloride.l-l O A mixture of 14.8 g of 2-amino-1-[[(obromophenyl)-thio]methyl]pyridine, 13.8 g of anhy- 59 drous potassium carbonate, 0.5 g of copper bronze, and 400 ml of anhydrous n-propanol is stirred and heated under nitrogen for about eighty hours, filtered hot, and the filtrate concentrated to dryness in vacuo. The residue is distributed between 250 ml of water and ether,

the ether layer is separated, dried, and concentrated to give about 7.2 g ofthe base product. By the usual methods, the base gives a hydrochloride, monohydrate, mp

A mixture of 68.2 g of the product from example 27 and 98.0 g of phosphorus pentachloride is blended until liquefaction occurs, diluted with 600 ml of ether and then poured on 1.3 kg of crushed ice. Workup of the ether layer yields about 47.3 g of the named compound, bp about 98 (0.5 mm.).

EXAMPLE 31 2-Aminol [(2-bromo-4-chlorophenyl )thio methyl pyridinium chloride.

To a solution of 18.8 g of 2-aminopyridine in 180 ml of benzene is added 54.6 g of the product from example 30, andthe mixture stirred and heated under reflux for about 12 hours. The cooled mixture is filtered to give about 62.8 g of the named compound, mp about 240-242.

EXAMPLE 32 2-Chloro-6H-pyrido[1,'2-c][1,3,5]benzothiadiazepine Hydrochloride H O A mixture of'7.4 g of the product from example 31, 2.8 g of anhydrous potassium carbonate, 0.1 g of copper bronze, and 100 ml of anhydrous n-butanol is heated at for about 15 hours. Workup as in example 7 yields about 3.6 g of the named compound, mp about 262264.

EXAMPLE 33-41 By substituting equivalent amounts of the pyridinium chlorides in column 2 vfor the 2-amino-l-[[(obromophenyl)-thio]methyl]pyridin ium chloride in example 7, the correspondingly substituted 6H- pyrido[1,2-c][1,3,5]benzothiadiazepines shown in column 3 are obtained.

Substd. 6E-pyrid0[1,2-c][1,3,5]

Example No. Pyz'idinium chlon'de benzothiadiazepines o1 e1 6 o O NH C1 N s i C11 (111 s Substd. 6-pyrido[1,2-c][1,3,5]

benzothiadiazepines Example No.

Pyridinium chloride cmomo a S s s N s N Q I 1 H H C C C m m w mm sl 1 r 4 a N 0 2B H u o r N v s e. U m e c 1 Nile m H. Q 2 N S N m m .u H O M mm m w m 1. H H 0 0 C m m u chloride. The clear solution that is formed is diluted with anhydrous ether until a turbidity persists and is then cooled to give the pale yellow crystalline product. 10

Recrystallization from aceton'itrile gives about 1.0 g of the named product, mp about 298-300(dec.).

- EXAMPLE 43 6,7-Dihydro-7-n-propylpyrido[1,2- d l,4,6]benzothiadiazocine, hydrochloride A. o-Bromophenyl 2-chloro-l-pentyl sulfide To a solution of 23.0 g of sodium metal in 500 ml of absolute ethanol is added, in about 0.5 hour, a solution of 173.0 g of o-bromothio-phenol in 250 ml of absolute ethanol. The mixture is stirred and heated under reflux for about 0.5 hour, cooled to and treated, dropwise, with 185.5 g of l-bromo-2-chloropentane. The addition requires about 1 hour. The mixture is stirred for about 2 hours at 0,warmed slowly to reflux, and then heated under reflux for two hours. The mixture is filtered and the filtrate concentrated in vacuo at 40 to give about 255.7 g of o-bromophenyl 2-chloro-l-pentyl sulfide as a pale yellow oil.

B. Z-Amino-1-[2-(o-bromophenylthio-1-pentyl)]- pyridinium chloride To a solution of 58.7 g of the product from A and 18.4 g of Z-aminopyridine in 200 ml of anhydrous toluene is heated under reflux for about 6 hours, cooled, and the crystalline product filtered to give about 67.2 g of the title compound as a pale yellow crystalline solid.

C. l-[2'-(o-Bromophenylthio-l-pentyl)]-l,2-dihydro-2-iminopyridine To a solution of 7.7 g of the product from B in 100 ml of 95% ethanol is added 2.8 g of potassium carbonate and the mixture is stirred atabout 40 for 1 hour, filtered and the filtrate concentrated in vacuo. The residue is recrystallized from cyclohexane to give 6.3 g of 1 -[2'-(o-bromophenylthi0)-1-pentyl) ]-l ,2-dihydro-2-' iminopyridine as a pale yellow crystalline solid.

D. 6,7-Dihydro-7-n-propylpyrido[ l,2-d][1,4,6]- benzothiadiazocine, hydrochloride The product from C, 15.4 g, 13.8 g of anhydrous micronized potassium carbonate, 0.5 g of copper bronze and 100 ml of anhydrousn-butanol are stirred and heated under reflux for about 48 hours, filtered, and the filtrate concentrated, in vacuo, to give the product as a deep yellow-colored viscous oil. The oil, 12.7 g, in 120 ml of anhydrous ether is cooled to 0 and treated slowly, with stirring with 10 ml of 1.5 N ethereal hydrogen chloride. The solid that separates is filtered, and recrystallization from 2-propanol to give the title compound, mp about 210-2l2, as a pale yellow crystalline product.

EXAMPLES 44-47 Following the procedures of examples l-7 but substituting for o-bromobenzenethiol in example 1 the substituted o-bromobenzenethiol indicated in column I, there is obtained the correspondingly substituted compound of formula I wherein R and the position it occupies are indicated in column I] I ll 44. 2-bromo-6-fluorothiophenol 4 fluoro 45. Z-bromo-3-chlorothiophenol l-chloro 46. 2,4-dibromothiophenol Z-bromo 47. 2-bromo-5-phenylaniline 3-phenyl EXAMPLES 48-53 Following the procedure of examples 1 7 but substituting for o-bromobenzenethiol in example 1 the substituted o-bromobenzenethiol indicated in column I, and substituting for Z-aminopyridine in example 3 the substituted pyridine indicated in column Il, there is obtained the correspondingly substituted compound of formula I wherein the substituent R and the position it occupies are indicated in column III and the substituent R and the position it occupies are indicated in column lV.

Following the procedure of example 43 but substituting for 2-aminopyridine in part B the substituted 2- aminopyridine indicated in column 1, there is obtained the following compound of formula I wherein the substituent R and the position it occupies are indicated in column I] I II 54. 2amino-5-(p-butoxyphenyl) l(p-butoxyphcnyl) pyridine 55. 2-amino-3-(p-trifluoro- 12-(p-trifluoromethyl methylphenyl) phenyl)pyridine 56. 2 amino-3-(methylmercapto)- IZ-(methylmercapto) pyridine 57. 2-amino-6-(phenylmercapto) 9-(phetiylmercapto) pyridine 58. 2-amino-4-(phenylmercapto)- ll-(phenylmercapto) pyridine 59. 2-amino-3-(phenylmercapto)- 12-(phenylmereapto) pyridine 60. 2-amino-6-(methylmercapto} 9-(methylmercapto) pyridine g 61. 2-amino-5-(butylmercaptci)- l0(butylmercapto) pyridine I 62. 2-amino-5-(propylmercapto)- -(propylmercapto) pyridine 63. 2-amino-4-(methylmercaptoy 1 l-(methylmercapto) pyridine 64. 2-amino-4;(ethylmercapto)- lI-(ethylmercapto) pyridine 65. 2-amino-4-(ethylmereapto)-6- l 1-(ethylmercapto)- methylpyridine 9-methy 66. 2-arn ino-3-(phenethyhl2-(phenethyl) pyridine 67. 2-amino-4-benzylpyridine l l-benzyl 68. 2-amino-5-(phenethyl)- IO-(phenethyl) pyridine 2-amino-6-benzylpyridine 9-benzyl 70. 2-amino-6-phenoxypyridine 9-phenoxy 71. 2 amino-4-phenoxypyridine ll-phenoxy EXAMPLES 72-74 Following the procedure of examples 17 but substi-' tuting for bromomethanesulfonic acid, sodium salt in example 1 the bromoalkylsulfonic acid, sodium salt listed in column I, there is obtained the compound of formula I wherein R" is the radical indicated in column II.

72. l-bromoethane-Isulfonic acid, -CH

sodium salt 73. l-bromob utane-l sulfonic acid. -CH CH CH sodium salt 74. 1-brom0-2-methylpropane-l- CH(CH sulfonic acid, sodium salt EXAMPLE 75 2-Trifluoromethyl-6I-I-Pyrido[1,2- c][1,3,5lbenzothiadiazepine-S,S-dioxide talline solid is filtered to give 189.3 g ofoz,oz,oz-trifluorop-acetotoluidide.

B. a,a,a-Trifluoro-p-N,N-diacetotoluidide The product from A, 102.0 g, and 500 ml of acetic anhydride are heated under reflux for about 18 hours.

The mixture is then concentrated in vacuo to remove the excess of acetic anhydride. The residual solid crystallizes and is recrystallized from heptane to give 136.7 g of a,a,a-trifluoro-p-N,N-diacetotoluidide.

C. 2-Bromo-a,a,a-trif1uoro-p-N,N-diacetotoluididc To a solution of 50.6 g of the product from B in 120 ml of carbon tetrachloride is added 35.6 g of N- bromosuccinimide and the mixture is stirred and heated under reflux for about 0.25 hours. Workup according to the procedure of Arcoria and Scarlata [Ann. Chim, (Rome), 54, 139 (1964)]yields about 58.7 g of 2-bromo-a,a,a-trifluoro-p-N,N-diacetotoluidide.

D. 2-Br0mo-a,a,a-trifluoro-p-toluidine Hydrochloride The product from C, 58.0 g of 250 ml of 95% ethanol, and 10.0 ml of concentrated hydrochloric acid are heated under reflux for about 1 hours and then concentrated to dryness in vacuo. The residue crystallizes on cooling to give about 45.3 g of 2-bromo-a,a,a-trifluoro-p-toluidine hydrochloride.

E. 2-Bromo-a,a,a-trifluoro-p-toluenesulfonyl chloride Following the procedure of Meerwein, et al, .I. prakt. Chem., 152, 237(1939), 27.8 g of the product from D in 100 ml of 25% hydrochloric acid, at 0, is treated dropwise, with a solution of 6.9 g of sodium nitrite in 14 ml of water. Subsequent to the addition, the mixture is stirred at 0 for 0.5 hour, 0.5 g of cupric chloride is added and while kept at 0, a rapid stream of sulfur dioxide is introduced into the reaction mixture for 0.5 hour. Subsequently, the mixture is slowly warmed to 50 while the introduction ofsulfur dioxide continues. Workup of the reaction mixture gives 25.6 g of 2- bromo-a,a,a-trif1uoro-p-toluenesulfonyl chloride.

F. Sodium 2-bromo-oz,a,a-trifluoro-p-toluenesulfonate Into a suspension of 15.6 g of zinc dust in 115 ml of water is introduced dry steam until the internal temperature reaches The steam is shut off, and 32.4 g of the product from E is added in small portions during about ten minutes. Stirring is maintained throughout the addition and for about 10 minutes afterwards. Steam is again introduced into the mixture, with stirring, until the internal temperature reaches at which time the steam is shut off and 10 ml of 12N aqueous sodium hydroxide is added followed by 2.0 g portions of solid sodium carbonate until the mixture is strongly alkaline. Following this, the procedure of Org. Syntheses, Coll. Vol 1, 492 (1941) is followed to give about 24.7 g of sodium 2-bromo-a,a,a-trifluoro-p-toluenesulfonate.

G. 2-Bromo-a,a,a-trifluoro-p-tolyl Sulfone A mixture of 31.1 g of the product from F, 34.8 g of Bromomethyl 1,1-dibromomethane, 500 ml of absolute ethanol, 13.8

g of anhydrous, micronized potassium carbonate, and 0.5 g of copper bronze is stirred and heated under reflux for about 9.5 hours. The hot solution is filtered and the filtrate concentrated to a volume of about ml and cooled. The product that crystallizes is filtered to give about 30.6 g of 2-bromo-a,a,cx-trifluoro-p-tolyl bromomethyl sulfone.

H. 2-Trifluoromethyl-6H-pyridol 1,2- c][1,3,5lbenzothiadiazepine-S,S-dioxide Following the procedure of example 3 but substituting for o-bromophenyl chloromethyl sulfide an equivalent amount of the product from part G, there is obtained Z-amino-l-[[(2-bromo-4-a,a,a-trifluoro-ptoly1)sulfonyl]methyl]-pyridinium bromide. Following the procedure of example 7 but substituting the above Following the procedure of example 75 but substituting for l,l-dibromomethane in part G the dihaloalkane listed below in column I, there is obtained the compound of formula I of the formula wherein R" and n are as indicated in columns II and III:

diazepine, hydrochloride 400 Starch 80 Magnesium stearate The active ingredient, starch and magnesium stearate are blended together. The mixtureis used to fill hard shell capsules of a suitable size at a fill weight of 485 milligrams per capsule.

Example 81 Preparation of tablet formulation Ingredient Milligrams per Tablet diazepine-5,5-dioxide 300 Lactose 200 Corn starch (for mix) 50 Corn starch (for paste) 5O Magnesium stearate 6 The active ingredient, lactose and corn starch (for mix) are blended together. The corn starch (for paste) is suspended in water at a ratio of 10 grams of corn starch per 80 milliliters of water and heated with stirring to form a paste. This paste is then used to granulate the mixed powders. The wet granules are passed through a No. 8 screen and dried at 120F. The dry granules are passed through a No. 16 screen. The mixture is lubricated with magnesium stearate and compressed into tablets in a suitable tableting machine. Each tablet contains 300 milligrams of active ingredient.

Example 82 Preparation of oral syrup formulation Ingredient Amount 5 6,7-Dihydro-7-n-propylpyrido-ll,2-d]- I l,4,6]bcnzothiadiazocine, hydrochloride Sorbitol solution (70% NF.) Sodium bcnzoate Sucaryl Saccharin Red Dye (FD. & Cov No. 2) Cherry flavor Distilled water 500 mg. 40 ml. 150 mg. 90 mg. 10 mg. l0 mg. 50mg.

gs to 100ml.

The sorbitol solution is added to 40 milliliters of distilled. water and the active ingredient is suspended therein. The sucaryl, saccharin, sodium benzoate, flavor and dye are added and dissolved in the above solution. The volume is adjusted to 100 milliliters with distilled water. I

Other ingredients may replace those listed in the above formulation. For example, a suspending agent such as bentonite magma, tragacanth, carboxymethylcellulose, or methylcellulose may be used. Phosphates, citrates or tartrates may be added as buffers. Preserva tives may include the parabens, sorbic acid and the like and other flavors and dyes may be used in place of those listed above.

What is claimed is:

l. A compound of the formula omen-t)" z (Rug wherein m is l or 2;

R is the same or different and is hydrogen, halogen (F, Cl, or Br), alkyl of from one to four carbons, alkoxy of from one to four carbons, alkylthio of from one to four carbons, benzyl, phenethyl, phenyl, phenoxy, phenylthio or mono-substituted phenyl wherein the substituent may be halogen (F, Cl, Br or I), alkyl of from one to four carbons, alkoxy of from one to four carbons, or trifluoromethyl; provided that when R is halogen, R occupies only the 3- or S-position in the original 2-aminopyridine',

R is hydrogen, halogen (F, C1 or Br), alkyl of from one to four carbons, phenyl, dialkylamidosulfonyl wherein each alkyl radical is from one to four carbons or trifluoromethyl',

n is 0 or I;

R" is alkyl of from I to 4 carbons and Z is S or S0 and pharmaceutically acceptable acid-addition salts.

2. A compound of claim 1 having the name 6H- pyrido[ l ,2-c][ 1,3,5 lbenzothiadiazepine, 2-chloro-6H- 0 pyrido[ l ,2'c][ l ,3,5 ]benzothiadiazepine, 6,7-dihydro7- n-propylpyrido[1,2-d][l,4,6]benzothiadiazocine, or

c][ 1,3,5 ]benzothiadiazepine-S,5-dioxide.

Page 1 of 2 UNITED STATES PATENT OFFIC CERTIFICATE OF (IQRREC'HUN PATENT NO. 1 3,857,850

DATED 3 December 31, 1974 INVENTOWS) 1 Harry Louis Yale and Ramesh B. Petigara It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 4, line 64, ")QCIV should read ---XXXI-- Column 5, line 1, "XXV" should read -=--)QG II--=-.

Column 5, line 6, ")QCV" should read QQCII-.

Column 5, line 9, "XXXII" and ")QQCIII" should read --XXXIII-- and -)QOCIV-- respectively.

Column 5, line 17, "XXIV" and "XXV" should read -QQCXI and --)QD II- respectively.

Column 5, line 29, "M111" and "XXXII" should read --III-- and --XXXIV-- respectively.

Column 5, line 35, "XXVI" should read -'-XXXV--.

Column 5. line 38, "W11" should read ---XXXVI--.

Column 5, line 50, "XXVI" and"XXVII" should read mow-- and QQCVI- respectively,

Column 9, line 1, "[methyl[" should' read -]methyl]=--== Column 10, example 9, third column "CH in the formula should read --CH Example 12, immediately above the number 12 delete "M1233". Column 14, line 25, "27" should read "-4-", Example 35, in the formula in the second column, "CH CH should read -CH CH O--. 3 2 Example 40, in the formula in the first column SCH n SCH Q should read Q Br Page 2 of 2 UNITED STATES PATENT UFFICE CERTTT TCATE @F CQEQTTQN PATENT NO. 1 3,857,850

DATED I Deceer BL, 1974 I'NVENTOWS) 1 Harry Louis Yale and Rama-sh B, Petigara It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Colunm l8, example 52,, column II should read --2amino-5-- (p-ethylphenyl)pyridine and column 4W should read ---9- (p-=-ethylphenyl Column 18, the formula at the bottom of the column should read N CH -CH -S Column 20, line 17, "hours" should rea ---='hour---.

Column 210 line 2, [methyl[" should read =-=-]methyl]-. Column 21, line 10, in the formula "CH(CH SO should read -CH (CH ri rfl ra Column 22, line 11, f'gs" should read -==-qs--==.,

r'gned an fiealed this thirtieth ll [SEAL] y 0? September 1975 Arrest:

ljUTHv C. MT TVSON C. MARSHALL DANN Ilrslmg ()jjrcer (ummr'ssr'um'r uj'larenrs and Trademark 

1. A COMPOUND OF THE FORMULA
 2. A compound of claim 1 having the name 6H-pyrido(1,2-c)(1,3, 5)benzothiadiazepine, 2-chloro-6H-pyrido(1,2-c)(1,3, 5)benzothiadiazepine, 6,7-dihydro7-n-propylpyrido(1,2-d)(1,4, 6)benzothiadiazocine, or 2-trifluoromethyl-6H-pyrido(1,2-c)(1, 3,5)benzothiadiazepine-5,5-dioxide. 